摘要
流域水文特征的提取与分析不仅为水文过程模拟提供重要参数,而且是流域水生态系统健康监测与评价的基础依据。本文基于30m空间分辨率DEM提取漓江流域水系、确定流域范围、划分子流域,并计算流域内河流长度、河网密度、水系分维等水系形态特征;根据流域内多年平均降雨量与径流资料,对流域及其子流域的径流系数进行计算。结果表明:①根据集水区面积域值与河网密度关系曲线,最终确定以网密度为0.53km·km-2提取水系;②根据流域内各主河道特征,以及流域水生态系统健康监测与评价尺度,最终将流域划分为15个子流域;③降雨量与径流深度空间分布趋势基本一致,但降雨量与径流系数趋势有差异,各子流域的径流系数为0.637～0.800,引起径流系数差异的主要原因有植被覆盖、地层岩性、人类活动等。
Abstract. Extraction and analysis of hydrological characteristics not only provide important parameters for the hydrological processes simulation ,but also offer beneficial support to health monitoring and evaluation of aquatic ecosystem. Based on DEM with 30 m resolution of Lijiang river basin,river network is extracted ;the watershed is determined ; the sub catchments are divided ; and the river length,river density,and fractal dimension are calculated,etc. According to the average rainfall and runoff data of many years, the runoff coefficient of drainage basin is calculated. The results indicate that. 1 ） By using the catchment threshold value and drainage density curve,the network density of 0. 53 km. km^-2is ultimately determined to extract the network. 2）With the main drainage line characteristics,and health monitoring and evaluation scale,the river is at last divided into 15 sub-watershed. 3）The spatial distribution trend of rainfall and runoff depth is basically the same ,with slight difference between rainfall and runoff coefficient. The runoff coefficient of each sub-watershed ranges from 0. 637 to 0. 800. Differences in runoff coefficient is mainly affected by vegetation cover,stratum lithology and human activities.
出处
《广西师范大学学报（自然科学版）》
CAS
北大核心
2012年第4期166-171,共6页
Journal of Guangxi Normal University:Natural Science Edition
基金
国家自然科学基金资助项目(40971280
30870345)
中央分成水资源费资助项目(2010-2011)
广西水利电力勘测设计研究院重点科技项目基金资助项目(20100013)
关键词
漓江流域
水文特征
空间分析
Lijiang river basin
hydrological characteristic
spatial analysis
